I think he'd be a disaster, so that's possibly a ringing endorsement as far as AB members would often see it :P
But a couple of particularly important points:
1. He's had State Laws changed to suit his own interests, by repealing laws that would have required him to resign as Governor in order to run for President, or by repealing (or at least severely curtailing) laws ensuring transparency of political spending and travel arrangements;
2. Plenty of laws attacking LGBT rights, and also women's rights in general, including introduction of a ban on abortion after six weeks of pregnancy, which in practice would be a near-total ban. The LGBT rights attacks include the "don't say gay" law, which functionally is the same as our own infamous Section 28.
3. Introduced laws that have led to, or at least have the effect of leading to, book bans in schools and public libraries. This really ought to be the most chilling part: it's sold as being about "parents' rights to control their children's education", but in reality ends up being an opportunity to remove debate or discussion about race, gender, sexuality, and critical views of Christianity.
https://www.nytimes.com/2023/04/22/books/book-ban-florida.html
4. The overall package is then an utter contempt for the US Constitution, particularly First Amendment rights to freedom of speech and expression. That alone makes him unfit to be President.